Sectional steam-boiler



(No Model.) 2 Sheets-Sheet 1.

L D. DAVIS. SBGTIONAL STEAM BOILER.

190.459,998. Patented sept.2z,1991.

(No Model.) 2 Sheets-Sheet 2.

L. D. DAVIS.

SEGTIONAL STEAM BOILBR.

No. 459,998. Patented Sept. 22, 1891.

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0C' 5110/091111, i; 6r ZeonQwZJf/S @ggg @at f ffy UNITED STATES PATENT GEETCE.

LEONARD D. DAVIS, OF ERIE, PENNSYLVANIA.

SECTINAL STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 459,998, dated September 22, 1891.

Application led December 30, 1890. Serial No. 376,306- (No model.)

To a/ZZ whom it may concern:

Be it known that I, LEONARD D. DAVIS, a

' citizen of the United States, residing at Erie,

in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Sectional Steam Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, forming part of this specification.

My invention consists in the improvements in sectional steam-boilers hereinafter set forth and explained, and illustrated in the accompanying drawings, in which Figure l is a side elevation of myimproved sectional steam-boiler. Fig. 2 is a front end elevation of same. Fig. 3 is a vertical crosssection of same on the line c in Fig. 1. Fig. 4 is a vertical longitudinal section of same on the line y fg in Fig. 2, looking in the direction of the arrow. Fig. 5 is a sectional detail showing the pipe connections to the side drums of the boiler.

Like letters refer to like parts in all of the figures.

In the construction shown in the drawings of my improved sectional steam-boiler, A is a longitudinal central steam-drum; B B', longitudinal side drums located, preferably, near the top and sides of the boiler and somewhat on a lower plane than the central drum A, and C C' are longitudinal mud-drums at the bottom of the sides of the boiler, prefera/bly directly under the side drums B B', these being connected together by a system of pipes, as hereinafter described. l

From the mud drums C and C' vertical pipes D and D' extend upward to a sufficient height to form the sides of the fire-box E, where they are coupled to horizontal pipes F and F', the pipes F being coupled to the pipes D in the mnd-drum C and the pipes F' to the pipes D in the mud-drum C', so as to alternate with each other and extend transversely across the top of the fire-box E from side to side of the boiler, where, by means of slightly-oblique return-bends f and f', the pipes F and F' are carried back and forth at a slight inclination above the fire-box E in the shape of oblong coils, as illustrated in Figs. 2 and 3, until the ends of the uppermost pipes band b' of these coils are connected to the side drums B and B. The coils F and F' are also preferably somewhat inclined from a perpendicular position, so as to stagger the coils, as illustrated in Figs. 1 and e, so as to the better expose the surfaces thereof to the action of the lire and heat from the fire-box E below them.

At the rea-r end of the fire-box E, I connect the lower end of a return-bend coil G to one of the mud-drums C C', which coil G extends back and forth transversely across the boiler by means of slightly-oblique return-bends g,

so as to form the rear end of the fire-box E,

and from the uppermost pipe c of the coils G a vertical pipe CZ extends upward and connects with one of the side drums B B', as shown in Fig. 1 and also by dotted lines in Fig. 2. Between the side drums B and B is also a horizontal return-bend coil R, substantially of the same length as the drums A and BB', the ends r'r'of this coil being connected with the drums B and B' on each side thereof and forming a direct connection between said drums. To one of the central of the returnbends of the coil R,I preferably also connect the feed-water pipe j, Yso that the feed-Water passes through the coil R each way directly into the drums B B. From the tops of the drums B B' pipes e e extend to and are connected with the central drum A, preferably about midway of its height.

At the corners of the boiler and connecting with the ends of the mud-drums C and C' are four large upright pipes H H' H2 H3. pipes I preferably place outside of the casing I of the boiler, and from the upper ends of the pipes H H' H2 H3, I run connecting-pipes h h h2 h3 into the ends of the side drums B and B' near the bottoms thereof, and I also connect the upper ends of the pipesoH H3 and lH' H2 together by means of transverse horizontalpipes J and J', and to the centers of the pipes J'and J', I connect pipes K and K',which extend through the casing I into the lower portion of the ends of the central drum A.

`In the central steam-drum A, at each side thereof, I secure hood-shaped deflectors k lo', which extend from the inside of the shell lof the drum A down over the inlets of the pipes These IOO e and e', so as to defiect any water carried into the drum A by said pipes downward toward the bottom of the drum, and in the top of the drum A,I also place a longitudinal detlector L, forming a dry-steam chamber M, the steam entering said chamber M by passing between the edges of the .deliector L and the sides of the drum A. I also place del'lectors N N' in the upper parts of the side drums B and B' to receive the impact of a sudden upflow of water from the pipes Z) b and prevent it somewhat from being carried by the force of the steam through the pipes e e into the drum A.

From the top of the central drum A a pipe S extends laterally to a vertical pipe T outside ol' the boiler-casing I, the lower end of said vertical pipe T being connected by a lateral pipe t to one of the unid-drums C', forming a continuous pipe connection between the steam chamber M in the top of the steamdruln A and the water in the mud-drum C. On the top of the pipe T, I place a steam-gage IT, and in the side of the pipe T, I place gagecocks V and a water-glass IV of usual and ordinary construction. To the central portion of the bottoms of the mud-drums C and C', I couple a blow-oft pipe O, having a stop-cock o. The grate-bars I) extend Afrom the front to the rearof the tire-box and rest upon supports of any convenient construction.

In operation the water and steam rise through the coils F, F', and G into the side drums B and B', and from thence the steam and such water as may be carried therewith pass to the central steam-drum A, the water circulating back through the pipes J .I from the central drum A and through the pipes 7L 71.' h2 7L to the downflow-pipes Il II' H2 113 into the mnd-drums C and C', from whence it passes upward again through the pipes D and D and coils F and F and coils G again to the drums B and B'.andAat the top of the boiler.

By the arrangement of the pipes and drums hereinbefore described I am enabled to pre' senta verylarge and eiiicient heating-surface and at the same time get such watercireula tion that I am enabled to operate the boiler with great economy and eiiiciency.

Having thus described my invention so as to enable others skilled in the art to which it appertains to construct-and use the sam e,what I claim as new, and desire to secure by Letters Patent of the United States, is-

l. The combination, in a sectional stea|n boiler, of a central drum A, side drums B B', and mud-drums C C', with uptlow-coils F li" and downtlow-pipes connecting said drums A and B B to said mud-drums C C', substalr tially as and for the purpose set forth.

2. The combination, in a sectional steamboiler, of longitudinal drums at the top and bottom of the sides ot the boiler, a central steam-drum at the top of said boiler,with up flow return-bend coils inclined both horizontally and vertically, connecting the side drums at the bottom and top of the boiler together, pipes e e', connecting the side drums at the top ot' the boiler to the central steam-drum at the top of the boiler, horizontal down flowpipes connecting the central steam-drum wltli the ends of the side drums at the top of the boiler, and vertical downliowpipes conneciing the ends of the upper side drums with the lower side di ums, substantially as and for the purpose set forth.

The combination, in a sectional steamboiler, of drums A, B, and B' and C (,f' and downtlow connecting-pipes J J, 7L 71,' h2 h, and 1I, H', H2, and Ilconneeting said drums A and B B' with the drums C C', with npowpipes D D and return-bend coils F, F', and G, connecting the drums C C with the drums B B', a horizontal return-bend coil R, con necting the drums B B', and pipes e e', .connecting the drums A and B B', substantially as and for the purpose set forth.

l. The combination, in a sectional steamboiler, ot' side drums B B at the top oil the boiler, and a cent-ral drum A,witli pipes e and e', connecting said side drums to said central. drum, and hood-shaped detlectors on thc inside ot the drum A over the ends ol' the pipes e e', substantially as and for the purpose set forth.

In testimony whereof I affix my signatn re in presence of two witnesses.

LEONARD I). DAVIS.

Witnesses ALBERT O. MGKENDREE, J oi-IN W. linnen. 

